OpenAI API Adds 12-Hour Prompt Caching for Long-Running Agents

OpenAI's API now supports 12-hour prompt caching alongside the default 30-minute option, letting long-running agents reuse shared instructions, tools, and context all day at discounted rates.

2026-10-21 ~ 2026-10-21 · 3 related posts

• OpenAI API adds 12-hour prompt caching option alongside 30-minute default — OpenAIDevs · 2026-10-21
• OpenAI adds 12-hour prompt caching; an agent opens an integration PR within minutes — heyneighbor · 2026-10-21

1 near-duplicate retellings: nikunjhanda